Measuring USB-C current consumption

laz232

macrumors 6502
Original poster
Feb 4, 2016
470
774
At a café near you
Is there a terminal (or GUI) method of getting the USB-C current draw of an attached peripheral device connected to a MacBook Pro (actual draw, not class specification)? AFAIK the USB-C power monitor devices only pass through power, not full speed data.

I would like to compare power consumption of some of the USB-C docks.
 
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laz232

macrumors 6502
Original poster
Feb 4, 2016
470
774
At a café near you
Lon at Lon.tv in this YouTube vid seems to be using a device that would fit your needs:

It appears (watching the video) that is only passes through power - I want to measure power consumption of attached peripherals.
[doublepost=1547278367][/doublepost]
Do you want me to find one that specifically meets your needs? If so, list them here and I'll get on it next week.
Not sure if that is missing a /s tag. I want to measure the current consumption of USB-C attached peripherals (as per original post) whilst they are operating in USB-C mode.
 
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HenryAZ

macrumors 6502a
Jan 9, 2010
624
107
South Congress AZ
Well, you could take a short USB-C extension cable, cut off the insulation, isolate the two power wires and route them through your DMM in ammeter mode in series (inline).
 
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laz232

macrumors 6502
Original poster
Feb 4, 2016
470
774
At a café near you
Well, you could take a short USB-C extension cable, cut off the insulation, isolate the two power wires and route them through your DMM in ammeter mode in series (inline).
Thanks, but for various reasons I don't want to do that: the multiple wires that need to be cut, the burden voltage of the DMM and that I need to identify the 4 wires: (A4, A9, B4, B9).

Also for the price of a USB-C extension cable here (no - there is no Amazon Basics available here) then I might as well put that into a device rather than a hack.
 
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